I'd be inclined to look at Seacam's offering, as suggested above, if your budget will stretch. You'll always get good support from them, and Seacam now use their own electronics in the Seaflash.
Alternatively it may be worth looking at Hartenberger - http://www.hartenberger.de/
expensive, but they are top end products much like the Seacam strobes (and have removable batteries as standard).
Steve
Thank you Steve! I looked at Hartenbergers time ago but noone in the forums seemed to use them. They look really good and the website is very good and very explanating (is that a verb?
) I´ll check them. As for Seacam I´ll check but a friend of mine ordered a housing and a Seaflash in april and no news jet.....(and no news IS NOT good news!!!
)